KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 57. N:0 6. 



51 



Buellia (sect. Eubuellia) discreta Darb.! in Wiss. Ergebn. Schwedisch. Süd- 

 pol. -Expedit., vol. IV, Liefrg. 11, 1912, p. 14, tab. III, fig. 25 et in Nation. Antarct. 

 Expedit. 1901 — 1904, vol. V, 1910, p. 7, tab. I, fig. 4. 



Thallus epilithicus, crustaceus, uniformis, tenuissimus, 0,i — 0,15 mm crassus, 

 effusus vel maculatim dispersus, protothallo cinereo-nigricanti insidens, ochraceo- vel 

 umbrino-fuscatus, rarius magis in cinereum vergens, opacus, KHO — , CaCJ 2 0 2 — , 

 continuus vel hinc inde tenuissime et irregulariter fissus, sorediis et isidiis destitutus, 

 strato corticali angusto, ex hyphis intricatis formato, superne strato amorpho, deco- 

 lore et tenui obducto vestitus, gonidia fere totum thallum occupantia, cellulis glo- 

 bosis, 8 — 13 [x latis; hyphae thalli non amylaceae, ad 3.5 [x crassae, ramosae et intri- 

 catae, non inspersae, plus minus verticales et imprimis versus basin thalli constricto- 

 septatae. 



Apothecia lecideina, dispersa vel approximata, adpresso-sessilia, rotunda, minuta, 

 0 ; 2— 0,4 mm lata, nigra, opaca, epruinosa, primum concava, demum leviter convexa; 

 margo proprius tenuis, niger, acutiusculus, leviter prominulus, demum depressus; 

 excipulum integrum, fusco-nigrum, intus versus hymenium lutescenti-fuscescens, cras- 

 sura, superne ad verticem hymenii inflexum; epithecium angustum, amorphum, de- 

 color; hymenium superne anguste obscure fuscum, NO,, — , caeterum decolor, non 

 inspersum, 80 — 90 ;j- altum, J coeruleum; paraphyses tenues, ad 1,5 \i. crassae, filifor- 

 mes, simplices, eseptatae, ad apices clavato-capitatae et conglutinat ellipsoideo- 

 clavati, ad apicem retuso-rotundati et primum membrana valde incrassata cincti, 

 6 — 8, rare 4-spori; sporae in ascis 2 — 3-seriales, in juventute dilute fumosae, demum 

 fuscae, late ellipsoideae vel subovales, utplurimum rectae, loculis primum distantibus, 

 ad basin retusis vel subobconicis, tubnlo junctis, circa l / 3 longitudinis sporae aequan- 

 tibus, demum approximatis, septo tenui et imperforato separatis, 12 — 16 \j, longae et 

 7,5 — 8 [x latae. 



Conceptacula pycnoconidiorum punctiformia, nigra, nitida, vertice convexo vel 

 fere semigloboso prominula, globosa; perifulcrium pallidum; fulcra exobasidialia, basidia 

 fastigiata, subampullacea, pycnoconidiis multum breviora; pycnoconidia filiformia, 

 utrinque retusa, hamata vel rarius curvata, 13 — 16 [t longa et ad 1 ;j. lata. 



Falkland-Inseln: Ostinsel, Darwin Harbour, auf Schiefer. 



Die Art steht der Buellia myriocarpa (DC.) ebenfalls nahe, die siphoniaten 

 Sporen weisen schon darauf hin, aber auch sie muss wegen ihres Habitus und der 

 Merkmale im inneren Fruchtbau als eigene Art angesehen werden. 



Buellia (sect. Eubuellia) subviolascens A. Zahlbr. nov. spec. 



Thallus epilithicus, crustaceus, uniformis, tartareus, tenuis, 0.2—0,25 mm crassus, 

 cinereo-albicans, opacus, KHO spurie vel dilute violascens, CaC] 2 0 2 — , minute areo- 

 latus vel areolato-diffractus, areolis planis, plus minus angulosis, 0.2 — 0.5 mm latis, 

 fissuris parum hiantibus separatis, soredia et isidia desunt; protothallus niger, an- 

 gustus, thallum limitans vel eum percurrens; Stratum corticale angustum, ex hyphis 

 intricatis, leviter inspersis formatum; gonidia crebra, cellulis globosis, usque 18 ^ 



